manual transmission OPEL FRONTERA 1998 Workshop Manual

6A–48
ENGINE MECHANICAL
Engine Assembly
Removal
035RW027
1. Disconnect battery ground and positive cable.
2. Remove battery.
3. Make alignment mark on the engine hood and hinges
before removal in order to return the hood to original
position exactly.
4. Remove engine hood.
5. Drain radiator coolant.
6. Disconnect accelerator cable and automatic cruise
control cable from throttle valve on common
chamber.
7. Disconnect air duct with air cleaner cover.
8. Remove air cleaner assembly.
9. Disconnect canister vacuum hose.
10. Disconnect vacuum booster hose.
11. Disconnect three engine harness connectors.
12. Disconnect harness connector to transmission (left
front side of engine compartment), disconnect shift
on the fly harness connector from front side of front
axle and remove transmission harness bracket from
engine left side.
13. Disconnect ground cable between engine and frame.
14. Disconnect bonding cable connector on the back of
right dash panel.
15. Disconnect bonding cable terminal on the left bank.
16. Disconnect starter harness connector from starter.
17. Disconnect generator harness connector from
generator.
18. Disconnect coolant reserve tank hose from radiator.
19. Remove radiator upper and lower hoses.
20. Remove upper fan shroud.
21. Remove cooling fan assembly four fixing nuts, then
the cooling fan assembly.
22. Move drive belt tensioner to loose side using wrench
then remove drive belt.23. Remove power steering pump fixing bolts, then
power steering pump. Place the power steering pump
along with piping on the body side.
24. Remove air conditioning compressor fixing bolts from
bracket and place the compressor along with piping
on the body side.
25. Remove O
2 sensor harness connectors from exhaust
front pipe.
26. Remove three exhaust pipe fixing nuts from each
bank.
27. Remove two exhaust pipe fixing nuts from each
exhaust pipe, then move exhaust pipe to rear side of
vehicle.
28. Remove flywheel dust covers.
29. Disconnect two heater hoses from engine.
30. Disconnect fuel hoses from right side of transmission.
CAUTION: Plug fuel pipes on engine side and fuel
hoses from fuel tank.
31. Remove transmission assembly. Refer to
Transmission section in this manual.
32. Support the engine by engine hoist.
33. Remove two left side engine mount fixing bolts from
engine mount on chassis side.
34. Remove two right side engine mount fixing bolts from
engine mount on chassis side.
35. Remove engine assembly.
Installation
CAUTION: W h e n a s s e m b l i n g t h e e n g i n e a n d
transmission, confirm that dowels have been
mounted in the specified positions at the engine
side. Take care that dowel positions are different
between the manual transmission and the automatic
transmission.

6A–49
ENGINE MECHANICAL
If the engine is assembled in the condition that the
dowels have not been mounted in the specified posi-
tions, the transmission may be damaged the trans-
mission.
012RS009
1. Install engine assembly. Tighten engine mount fixing
bolts to frame to the specified torque.
Torque: 41 Nꞏm (4.2 Kgꞏm/30 lb ft)
2. Reconnect fuel hose to fuel pipe on engine.
3. Install transmission assembly. Refer to Transmission
section in this manual.
4. Reconnect two heater hoses to engine.
5. Install flywheel dust covers.
6. Install exhaust pipe and temporally tighten two (each
bank) rear exhaust flange nuts then tighten three stud
nuts (each bank) between exhaust manifold and
exhaust pipe, finally tighten rear side nuts to the
specified torque.
Torque:
Nuts: 43 Nꞏm (4.4 Kgꞏm/32 lb ft)
Stud nuts: 67 Nꞏm (6.8 Kgꞏm/49 lb ft)
150RW061
Legend
(1) Exhaust Front Pipe RH
(2) O
2 Sensor (for IGM)
150RW062
Legend
(1) Exhaust Front Pipe LH
7. Reconnect O2 sensor connector.
8. Install cooling fan assembly and tighten bolts/nuts to
the specified torque.
Torque : 22 Nꞏm (2.2 Kgꞏm/16 lb ft) for fan pulley
and fan bracket.
Torque : 10 Nꞏm (1.0 Kgꞏm/88.5 lb in) for fan and
clutch assembly.

6A–50
ENGINE MECHANICAL
9. Install air conditioner compressor to engine and
tighten to the specified torque.
Torque :
M8 bolts : 22 Nꞏm (2.2 Kgꞏm/16 lb ft)
M10 bolts : 43 Nꞏm (4.4 Kgꞏm/32 lb ft)
10. Install power steering pump, tighten fixing bolt to the
specified torque.
Torque :
M8 bolts : 22Nꞏm (2.2 Kgꞏm/16 lb ft)
M10 bolts : 46 Nꞏm (4.7 Kgꞏm/34 lb ft)
11. Move drive belt tensioner to loose side using wrench,
then install drive belt to normal position.
850RW001
Legend
(1) Crankshaft Pulley
(2) Cooling Fan Pulley
(3) Tensioner
(4) Generator
(5) Air Conditioner Compressor
(6) Power Steering Oil Pump
(7) Drive Belt
12. Install upper fan shroud.
13. Reconnect radiator upper and lower hoses.
14. Reconnect coolant reserve tank hose to radiator.
15. Reconnect generator harness connector.
16. Reconnect starter harness connector.
17. Reconnect bonding cable terminal on left bank
18. Reconnect bonding cable terminal on the back of right
dash panel.19. Reconnect ground cable between engine and
chassis.
20. Reconnect harness connector to transmission and
install transmission harness bracket on engine left
side.
21. Reconnect three engine harness connectors.
22. Reconnect vacuum booster hose.
23. Reconnect canister vacuum hose.
24. Install air cleaner assembly.
25. Reconnect air duct.
26. Reconnect accelerator cable and automatic cruise
control cable to throttle valve on common chamber.
035RW007
Legend
(1) Throttle Valve Assembly
(2) Throttle Lever
(3) Idle Air Control Valve
(4) Throttle Position Sensor
27. Install engine hood to the original position.
Refer to installation procedure for Body section in
this manual.
Accelerator pedal cable adjustment
1. Loosen adjusting nut and lock nut.
2. Pull outer cable while fully closing the throttle
valve.
3. Tighten adjusting nut and lock nut temporarily.
4. Loosen adjusting nut by three turns and tighten
lock nut.
Then, manually operating the throttle valve, make
s u r e t h a t t h e v a l v e l e v e r r e t u r n s u p t o t h e s t o p p e r
screw.

6B–6
ENGINE COOLING
Draining and Refilling Cooling
System
Before draining the cooling system, inspect the system
and perform any necessary service to ensure that it is
clean, does not leak and is in proper working order. The
engine coolant (EC) level should be between the “MIN”
and “MAX” lines of reserve tank when the engine is cold.
If low, check for leakage and add EC up to the “MAX” line.
There should not be any excessive deposit of rust or
scales around the radiator cap or radiator filler hole, and
the EC should also be free from oil.
Replace the EC if excessively dirty.
1. Completely drain the cooling system by opening the
drain plug (2) at the bottom of the radiator.
110RW002
2. Remove the radiator cap.
WARNING: TO AVOID THE DANGER OF BEING
BURNED, DO NOT REMOVE THE CAP WHILE THE
ENGINE AND RADIATOR ARE STILL HOT.
SCALDING FLUID AND STEAM CAN BE BLOWN OUT
UNDER PRESSURE.
3. Disconnect all hoses from the EC reserve tank.
Scrub and clean the inside of the reserve tank with
soap and water. Flush it well with clean water, then
drain it. Install the reserve tank and hoses.
4. Refill the cooling system with the EC using a solution
that is at least 50 percent antifreeze but no more than
70 percent antifreeze.
5. Fill the radiator to the base of the filler neck.
Fill the EC reserve tank to “MAX” line when the engine
is cold.
6. Block the drive wheels and firmly apply the parking
brake. Shift an automatic transmission to “P” (Park)
or a manual transmission to neutral.
7. Remove the radiator cap. Start the engine and warm
it up at 2,500
3,000 rpm for about 30 minutes.
8. When the air comes out from the radiator filler neck
and the EC level has gone down, replenish with the
EC. Repeat this procedure until the EC level does not
go down. Then stop the engine and install the radiator
cap. Let the engine cool down.9. After the engine has cooled, replenish with EC up to
the “MAX” line of the reserve tank.
10. Start the engine. With the engine running at 3,000
rpm, make sure there is no running water sound from
the heater core (behind the center console).
11. If the running water sound is heard, repeat steps 8 to
10.

ENGINE ELECTRICAL6D1–3
a. VOLTAGE DOES NOT DROP BELOW THE
MINIMUM LISTED IN THE TABLE – The battery is
good and should be returned to service.
b. VOLTAGE IS LESS THAN MINIMUM LISTED –
Replace battery.
ESTIMATED TEMPERATURE
MINIMUM
VOLTAGE
FCV
70219.6
60169.5
50109.4
4049.3
30–19.1
20–78.9
10–128.7
0–188.5
The battery temperature must be estimated by feel
and by the temperature the battery has been
exposed to for the preceding few hours.
Battery Charging
Observe the following safety precautions when charging
the battery:
1. Never attempt to charge the battery when the fluid
level is below the lower level line on the side of the
battery. In this case, the battery must be replaced.
2. Pay close attention to the battery during charging
procedure.
Battery charging should be discontinued or the rate of
charge reduced if the battery feels hot to the touch.
Battery charging should be discontinued or the rate of
charge reduced if the battery begins to gas or spew
electrolyte from the vent holes.
3. In order to more easily view the hydrometer blue dot
or ring, it may be necessary to jiggle or tilt the battery.
4. Battery temperature can have a great effect on
battery charging capacity.
5. The sealed battery used on this vehicle may be either
quick charged or slow charged in the same manner as
other batteries.
Whichever method you decide to use, be sure that
you completely charge the battery. Never partially
charge the battery.
Jump Starting
Jump Starting with an Auxiliary (Booster)
Battery
CAUTION: Never push or tow the vehicle in an
attempt to start it. Serious damage to the emission
system as well as other vehicle parts will result.Treat both the discharged battery and the booster
battery with great care when using jumper cables.
Carefully follow the jump starting procedure, being
careful at all times to avoid sparking.
WARNING: FAILURE TO CAREFULLY FOLLOW THE
JUMP STARTING PROCEDURE COULD RESULT IN
THE FOLLOWING:
1. Serious personal injury, particularly to your eyes.
2. Property damage from a battery explosion, battery
acid, or an electrical fire.
3. Damage to the electronic components of one or both
vehicles particularly.
Never expose the battery to an open flame or electrical
spark. Gas generated by the battery may catch fire or
explode.
Remove any rings, watches, or other jewelry before
working around the battery. Protect your eyes by wearing
an approved set of goggles.
Never allow battery fluid to come in contact with your eyes
or skin.
Never allow battery fluid to come in contact with fabrics or
painted surfaces.
Battery fluid is a highly corrosive acid.
Should battery fluid come in contact with your eyes, skin,
fabric, or a painted surface, immediately and thoroughly
rinse the affected area with clean tap water.
Never allow metal tools or jumper cables to come in
contact with the positive battery terminal, or any other
metal surface of the vehicle. This will protect against a
short circuit.
Always keep batteries out of reach of young children.
Jump Starting Procedure
1. Set the vehicle parking brake.
If the vehicle is equipped with an automatic
transmission, place the selector level in the “PARK”
position.
If the vehicle is equipped with a manual transmission,
place the shift lever in the “NEUTRAL” position.
Turn “OFF” the ignition.
Turn “OFF” all lights and any other accessory
requiring electrical power.
2. Look at the built–in hydrometer.
If the indication area of the built–in hydrometer is
completely clear, do not try to jump start.
3. Attach the end of one jumper cable to the positive
terminal of the booster battery.
Attach the other end of the same cable to the positive
terminal of the discharged battery.
Do not allow the vehicles to touch each other. This will
cause a ground connection, effectively neutralizing
the charging procedure.
Be sure that the booster battery has a 12 volt rating.

6E–1 ENGINE DRIVEABILITY AND EMISSIONS
ENGINE
ENGINE DRIVEABILITY AND EMISSIONS
CONTENTS
Specifications 6E–5. . . . . . . . . . . . . . . . . . . . . . . . .
Tightening Specifications 6E–5. . . . . . . . . . . . . . .
Vehicle Type Specifications 6E–5. . . . . . . . . . . . .
Diagrams and Schematics 6E–6. . . . . . . . . . . . . . . .
PCM Wiring Diagram (1 of 11) 6E–6. . . . . . . . . . .
PCM Wiring Diagram (2 of 11) For EC,
THAILAND, SOUTH EAST ASIA, LATIN
AMERICA, GULF, SAUDI, CHINA. 6E–7. . . . . .
PCM Wiring Diagram (3 of 11) For SOUTH
AFRICA and EXP. 6E–8. . . . . . . . . . . . . . . . . . . . .
PCM Wiring Diagram (4 of 11) 6E–9. . . . . . . . . . .
PCM Wiring Diagram (5 of 11) 6E–10. . . . . . . . . . .
PCM Wiring Diagram (6 of 11) For
AUSTRALIA, THAILAND, SOUTH EAST
ASIA, LATIN AMERICA, GULF, SAUDI,
LATIN AMERICA. 6E–11. . . . . . . . . . . . . . . . . . . . .
PCM Wiring Diagram (7 of 11) For EC. 6E–12. . .
PCM Wiring Diagram (8 of 11) For EXPORT
and SOUTH AFRICA. 6E–13. . . . . . . . . . . . . . . . .
PCM Wiring Diagram (9 of 11) Except EXP
and SOUTH AFRICA 6E–14. . . . . . . . . . . . . . . . . .
PCM Wiring Diagram (10 of 11) For
EXPORT and SOUTH AFRICA 6E–15. . . . . . . . .
PCM Wiring Diagram (11 of 11) 6E–16. . . . . . . . . .
PCM Pinouts 6E–17. . . . . . . . . . . . . . . . . . . . . . . . . . .
PCM Pinout Table, 32-Way Red
Connector – Row “A” 6E–17. . . . . . . . . . . . . . . . . .
PCM Pinout Table, 32-Way Red
Connector – Row “B” 6E–19. . . . . . . . . . . . . . . . . .
PCM Pinout Table, 32-Way White
Connector – Row “C” (For EC) 6E–20. . . . . . . . . .
PCM Pinout Table, 32-Way White
Connector – Row “C” (For except EC) 6E–21. . .
PCM Pinout Table, 32-Way White
Connector – Row “D”
(For except EXPORT and SOUTH
AFRICA) 6E–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCM Pinout Table, 32-Way White
Connector – Row “D”
(For EXPORT and SOUTH AFRICA) 6E–23. . . . .
PCM Pinout Table, 32-Way Blue
Connector – Row “E”
(For except EXPORT and SOUTH
AFRICA) 6E–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCM Pinout Table, 32-Way Blue
Connector – Row “E”
(For EXPORT and SOUTH AFRICA) 6E–26. . . . .
PCM Pinout Table, 32-Way Blue
Connector – Row “F” 6E–27. . . . . . . . . . . . . . . . . .
Component Locators 6E–28. . . . . . . . . . . . . . . . . . . .
Engine Component Locator (This illustration
is based on RHD model.) 6E–28. . . . . . . . . . . . . . Engine Component Locator Table 6E–29. . . . . . . .
Engine Component Locator Table 6E–31. . . . . . . .
Undercarriage Component Locator 6E–32. . . . . .
Undercarriage Component Locator Table
(Automatic Transmission) 6E–32. . . . . . . . . . . . . .
Undercarriage Component Locator Table
(Manual Transmission) 6E–33. . . . . . . . . . . . . . . .
Fuse and Relay Panel (Underhood
Electrical Center) 6E–33. . . . . . . . . . . . . . . . . . . . .
Sensors and Miscellaneous Component
Locators 6E–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis 6E–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strategy-Based Diagnostics 6E–37. . . . . . . . . . . . .
Strategy-Based Diagnostics 6E–37. . . . . . . . . . . . .
DTC Stored 6E–37
. . . . . . . . . . . . . . . . . . . . . . . . . . .
No DTC 6E–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No Matching Symptom 6E–37. . . . . . . . . . . . . . . . .
Intermittents 6E–37. . . . . . . . . . . . . . . . . . . . . . . . . .
No Trouble Found 6E–37. . . . . . . . . . . . . . . . . . . . .
Verifying Vehicle Repair 6E–37. . . . . . . . . . . . . . . .
General Service Information 6E–38. . . . . . . . . . . . . .
OBD Serviceablity Issues 6E–38. . . . . . . . . . . . . . .
Maintenance Schedule 6E–38. . . . . . . . . . . . . . . . .
Visual / Physical Engine Compartment
Inspection 6E–38. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Knowledge of Tools Required 6E–38. . . . . .
Serial Data Communications 6E–38. . . . . . . . . . . . . .
Class II Serial Data Communications 6E–38. . . . .
On-Board Diagnostic (OBD) 6E–39. . . . . . . . . . . . . .
On-Board Diagnostic Tests 6E–39. . . . . . . . . . . . .
Comprehensive Component Monitor
Diagnostic Operation 6E–39. . . . . . . . . . . . . . . . . .
Common OBD Terms 6E–40. . . . . . . . . . . . . . . . . .
The Diagnostic Executive 6E–40. . . . . . . . . . . . . . .
DTC Types 6E–41. . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Vehicle Repair 6E–42. . . . . . . . . . . . . . . .
Reading Diagnostic Trouble Codes Using
A Tech 2 6E–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tech 2 Tech 2 6E–43. . . . . . . . . . . . . . . . . . . . . . . . .
Tech 2 Features 6E–43. . . . . . . . . . . . . . . . . . . . . . .
Getting Started 6E–44. . . . . . . . . . . . . . . . . . . . . . . .
Operating Procedure (For Example) 6E–44. . . . .
DTC Modes 6E–45. . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC Information Mode 6E–46. . . . . . . . . . . . . . . . .
Injector Balance Test 6E–46. . . . . . . . . . . . . . . . . . .
EGR Control Test 6E–47. . . . . . . . . . . . . . . . . . . . . .
Idle Air Control System Test 6E–48. . . . . . . . . . . . .

6E–20
ENGINE DRIVEABILITY AND EMISSIONS
PCM Pinout Table, 32-Way White Connector – Row “C” (For EC)
TS23345
PINPIN FunctionWire ColorIGN ONENG RUNRefer To
C1Injector Cylinder #4GRN/REDB+B+General Description and
Operation, Fuel Injector
C2Shift “B” SolenoidBRN/BLK0.0 V0.0 VAutomatic Transmission
(4L30E)
C3Injector Cylinder #6GRN/YELB+B+General Description and
Operation, Fuel Injector
C4Ignition Control (IC)
Cylinder #1RED0.0 V0.1 VGeneral Description and
Operation, Fuel Injector
C5Crankshaft Position
Sensor, “A” CircuitYEL0.3 V to 5 V2.2 VGeneral Description and
Operation, Crankshaft
Position Sensor
C6Not Used————
C7PCM GroundYEL0.0 V0.0 VChassis Electrical
C8PCM GroundBLK/PNK0.0 V0.0 VChassis Electrical
C9PCM GroundBLK/BLU0.0 V0.0 VChassis Electrical
C10TachometerBLK/RED8.8 V10.0 V
(at idle)Chassis Electrical
C11Variable Intake ManifoldYEL/BLK0.0 VB+ (rpm
3600 over)Manual Transmission
C12Alternator Control GainWHT/BLU10.5 VB+Chassis Electrical
C13Fuel PWMBLU/PNKB+B+—
C14Bank 2 HO2S 1 HighPNK0.4 V0.1-0.9 VGeneral Description and
Operation, Fuel HO2S 1
C15Bank 2 HO2S 1 LowBLU0.0 V0.1 VGeneral Description and
Operation, Fuel HO2S 1
C16Not Used————

6E–21 ENGINE DRIVEABILITY AND EMISSIONS
PCM Pinout Table, 32-Way White Connector – Row “C” (For except EC)
TS23345
PINPIN FunctionWire ColorIGN ONENG RUNRefer To
C1Injector Cylinder #4GRN/REDB+B+General Description and
Operation, Fuel Injector
C2Shift “B” SolenoidBRN/BLK0.0 V0.0 VAutomatic Transmission
(4L30E)
C3Injector Cylinder #6GRN/YELB+B+General Description and
Operation, Fuel Injector
C4Ignition Control (IC)
Cylinder #1RED0.0 V0.1 VGeneral Description and
Operation, Fuel Injector
C5Crankshaft Position
Sensor, “A” CircuitYEL0.3 V to 5 V2.2 VGeneral Description and
Operation, Crankshaft
Position Sensor
C6Not Used————
C7PCM GroundBLK/BLU0.0 V0.0 VChassis Electrical
C8PCM GroundBLK/PNK0.0 V0.0 VChassis Electrical
C9PCM GroundBLK/BLU0.0 V0.0 VChassis Electrical
C10TachometerBLK/RED8.8 V10.0 V
(at idle)Chassis Electrical
C11Variable Intake ManifoldYEL/BLK0.0 VB+ (rpm
3600 over)Manual Transmission
C12Not Used————
C13Not Used————
C14Not Used————
C15Not Used————
C16Not Used————

6E–33 ENGINE DRIVEABILITY AND EMISSIONS
Undercarriage Component Locator Table (Manual Transmission)
Number
NameLocation
1Fuel Pump AssemblyInstalled in the top of the fuel tank
2Fuel Gauge UnitInstalled in the front edge of the right frame
rail, ahead of the rear axle
3Fuel FilterLocated along the inside of the right frame rail,
ahead of the rear axle
4Vehicle Speed Sensor (VSS)2WD: Protrudes from the transmission
housing, just ahead of the propeller shaft.
4WD: Protrudes from the rear output shaft
housing of the transfer case.
5Heated Oxygen Sensor (Bank 1, HO2S 1)Threaded into the exhaust pipe ahead of the
right-hand catalytic converter
6Heated Oxygen Sensor (Bank 2, HO2S 1)Threaded into the exhaust pipe ahead of the
left-hand catalytic converter
Fuse and Relay Panel (Underhood Electrical Center)
TS23336

6E–65 ENGINE DRIVEABILITY AND EMISSIONS
Knock Sensor Diagnosis
The Tech 2 has two data displays available for diagnosing
the knock sensor (KS) system. The two displays are
described as follows:
“Knock Retard” indicates the number of degrees that
the spark timing is being retarded due to a knock
condition.
“KS Noise Channel” indicates the current voltage level
being monitored on the noise channel.
DTCs P0325 and P0327 are designed to diagnose the KS
module, the knock sensor, and the related wiring. The
problems encountered with the KS system should set a
DTC. However, if no DTC was set but the KS system is
suspect because of a detonation complaint, refer to
Detonation/Spark Knock in Symptoms.
Powertrain Control Module (PCM)
Diagnosis
To read and clear diagnostic trouble codes, use a Tech 2.
IMPORTANT:Use of a Tech 2 is recommended to clear
diagnostic trouble codes from the PCM memory.
Diagnostic trouble codes can also be cleared by turning
the ignition “OFF” and disconnecting the battery power
from the PCM for 30 seconds. Turning off the ignition and
disconnecting the battery power from the PCM will cause
all diagnostic information in the PCM memory to be
cleared. Therefore, all the diagnostic tests will have to be
re-run.
Since the PCM can have a failure which may affect only
one circuit, following the diagnostic procedures in this
section will determine which circuit has a problem and
where it is.
If a diagnostic chart indicates that the PCM connections
or the PCM is the cause of a problem, and the PCM is
replaced, but this does not correct the problem, one of the
following may be the reason:
There is a problem with the PCM terminal connections.
The terminals may have to be removed from the
connector in order to check them properly.
The problem is intermittent. This means that the
problem is not present at the time the system is being
checked. In this case, refer to the
Symptoms p o r t i o n o f
the manual and make a careful physical inspection of
all component and wiring associated with the affected
system.
There is a shorted solenoid, relay coil, or harness.
S o l e n o i d s a n d r e l a y s a r e t u r n e d “ O N ” a n d “ O F F ” b y t h e
PCM using internal electronic switches called drivers.
A shorted solenoid, relay coil, or harness will not
damage the PCM but will cause the solenoid or relay to
be inoperative.
Multiple PCM Information Sensor
DTCS Set
Circuit Description
The powertrain control module (PCM) monitors various
sensors to determine the engine operating conditions.
The PCM controls fuel delivery, spark advance,
transmission operation, and emission control device
operation based on the sensor inputs.The PCM provides a sensor ground to all of the sensors.
The PCM applies 5 volts through a pull-up resistor, and
determines the status of the following sensors by
monitoring the voltage present between the 5-volt supply
and the resistor:
The engine coolant temperature (ETC) sensor
The intake air temperature (IAT) sensor
The transmission fluid temperature (TFT) sensor
The PCM provides the following sensors with a 5-volt
reference and a sensor ground signal:
The exhaust gas recirculating (EGR) pintle position
sensor
The throttle position (TP) sensor
The manifold absolute pressure (MAP) sensor
The PCM monitors the separate feedback signals from
these sensors in order to determine their operating
status.
Diagnostic Aids
IMPORTANT:Be sure to inspect PCM and engine
grounds for being secure and clean.
A short to voltage in one of the sensor input circuits may
cause one or more of the following DTCs to be set:
P0108
P0113
P0118
P0123
P0560
P0712
P0406
IMPORTANT:If a sensor input circuit has been shorted
to voltage, ensure that the sensor is not damaged. A
damaged sensor will continue to indicate a high or low
voltage after the affected circuit has been repaired. If the
sensor has been damaged, replace it.
An open in the sensor ground circuit between the PCM
and the splice will cause one or more of the following
DTCs to be set:
P0108
P0113
P0118
P0123
P0712
P0406
A short to ground in the 5-volt reference A or B circuit will
cause one or more of the following DTCs to be set:
P0107
P0122
In the 5-volt reference circuit A, between the PCM and the
splice, will cause one or more of the following DTCs to be
set:
P0122
In the 5-volt reference circuit B, between the PCM and the
splice, will cause one or more of the following DTCs to be
set:
P0107
Check for the following conditions: